Update 2022-04-02: This document is obsolete!
The original PS1Digital firmware was replaced by a FX-Framework based firmware maintained by Pixel FX
Refer to PS1Digital Black Dog Tech to Pixel FX firmware transition guide on how to upgrade. BDT PS1Digital firmware 1.7.0 is availbale on the
develop update channel.
Original version: 2020-01-18, last update: 2021-11-19
PS1Digital is a digitial to digitial HDMI mod for Playstation 1
Command line tools for ps1digital. This currently implements a workflow for custom OSD font/character maps and custom gamma maps.
PS1Digital signal test software
Simple PS1 software for the OSD signal test. This creates full RGB888 test images suitable to test the installation.
Support for all PS1 output resolutions
This is working, except the correct vertical alignment of 256p and 512i.
Is there even a game out there which uses these modes?
|vertical \ horizontal||256||320||384||512||640|
256, 384 and 512 horizontal resolutions are interpolated to match the 4:3 picture aspect ratio
Done, but needs some tweaking
Configurable (fast/instant) interlaced/progressive switching
Interlaced video uses 262.5 total lines (263/262, depending on displayed field), while progressive uses 263 lines. The HDMI link is kept active, when a switch from interlaced to progressive (and back) is occuring, but the video timings change. Some monitors/TVs can handle this without loosing sync, others do not.
PS1Digital supports forcing 240p (480i) based output timings, so no HDMI sync drop will happen. Input video and output video will be (slightly) out of sync (when interlaced is forced to progressive and vice versa), so a tearing effect occurs periodcally)
VGA/480p, 960p and 1080p for NTSC consoles
576p for PAL consoles
Input video color mode (RGB555, RGB565, ...) is detected and converted to RGB888.
Gamma correction with option for custom color mapping
PS1Digital supports gamma correction and also allows the creation of custom maps, which can be uploaded through the web interface.
Digital sound via HDMI
I2S signal from the audio DAC is embedded into HDMI.
WiFi firmware updates
Bob/weave deinterlacing can be selected via OSD.
Controller integration / OSD
will integrate integrates an ESP32 port of PsNee. Thanks to rama3! (nfggames.com) WIP, latest board revision is already prepared for this (incl. flat flex)
NTSC/PAL reference oscillator mod integration
PS1Digital uses a programmable PLL to create the various clocks needed for operation.
This could also be used to integrate this mod.
Further testing and another hardware revision needed
PS1Digital can take control of the GPU clock. This will be the recommended default install method, but it can also be used with the original PS1 clock.
This allows correct frame rates, when running NTSC games on PAL consoles and vice versa.
Only one resisitor has to be removed, no trace cutting needed.
Done (2020-04-17), Updated (2020-04-23)
Fully PSIO compatible
Fully XStation compatible
960p50 and 1080p50 upscaling for PAL
Custom OSD fonts
See Quick guide to fonts/character maps for details.
Done (2020-05-17), Updated (2020-09-15)
Custom gamma maps
See Quick guide to gamma/color maps for details.
Done (2020-05-17), Updated (2020-09-15)
XStation: reset to loader
IAP (Installer access point) mode
Installer Readme for details.
OSD option to configure horizontal scaling mode for each input resolution
Horizontal scaler can be configured for each input resolution:
auto (maintain a 4:3 aspect ratio with linear interpolation for input resolutions not having a 4:3 aspect ratio already)
1x - 8x (fixed scaling multiplier)
OSD option to configure vertical scaling per input resolution for output modes 960p and 1080p
2x - 4x (960p) and 2x - 5x (1080p)
3x - 6x (960p/1080p)
Done (2020-09-26), Updated (2020-09-29)
Improved input video format detection
Input video format is now detected within 1 frame/field
Glitchless 240p/480i switching in force modes
Memory alignment was changed to prevent video glitches during resolution switching in force 240p/480i mode.
XStation: OSD lid switch control
Toggle lid switch from the OSD.
Fixed: PsNee is now working correctly
Automatic vertical alignment correction
Fully standard compliant 1080p and 960p timings
New clock adjust modes for seamless 240p/480i, 480i/240p switching without tearing
vfr-hdmi adjusts hdmi clock
overclock overclocks PS1 GPU clock
Refer to Advanced Video Settings for details
Per game settings using an ODE transmitting the game id of the game currently running
1200p (1600x1200px) output resolution
CEC control of the OSD
Sinden Lightgun (border) support
Negcon controller support
PSX developer mode: Connect to PS1 serial port using TCP/IP
Available via the
develop update channel
Fixed scanlines for all scale factors
Thin scanlines are now scaled correctly with a manually configured scale factor.
Very thin scanlines remain implemented as a post scale filter (Every odd or even output line is a scanline).
Thick scanline were removed.
Advanced deinterlacing not feasible
Wireless serial port
Developer mode serial port is available since firnmware v1.6.2.
720p50 and 720p60 upscaling